package com.hkzhao.shixun.component;

import com.hkzhao.shixun.common.utils.JwtTokenUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * <h3>j2ee</h3>
 * <p>jwt登录的过滤器</p>
 *
 * @author : hkzhao
 * @date : 2020-06-05 12:38
 **/
public class JwtAuthenticationTokenFilter  extends OncePerRequestFilter {
    private static final Logger LOGGER = LoggerFactory.getLogger(JwtAuthenticationTokenFilter.class);
    @Autowired
    private UserDetailsService userDetailsService;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Value("${jwt.tokenHeader}")
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest,
                                    HttpServletResponse httpServletResponse,
                                    FilterChain filterChain) throws ServletException, IOException {
        String authHeader = httpServletRequest.getHeader(this.tokenHeader);
        if(authHeader!=null&&authHeader.startsWith(this.tokenHead)){
            String authToken = authHeader.substring(this.tokenHead.length());
            String username = jwtTokenUtil.getUserNameFromToken(authToken);
            LOGGER.info("checking username:{}", username);
            if(username!=null&& SecurityContextHolder.getContext().getAuthentication()==null){
                UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
                if(jwtTokenUtil.validateToken(authToken,userDetails)){
                    UsernamePasswordAuthenticationToken authenticationToken
                            = new UsernamePasswordAuthenticationToken(userDetails,null,userDetails.getAuthorities());
                    authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(httpServletRequest));
                    LOGGER.info("authenticated user:{}", username);
                    SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                }
            }
        }
        filterChain.doFilter(httpServletRequest,httpServletResponse);
    }
}